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    <title>Document</title>
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<script>
    /**
     * @description: 封装一个函数 sendAJAX请求 发送GET请求
     * @param {*} URL
     * @return {*} Promise 对象
     */
    function sendAJAX(url) {
        return new Promise((resolve, reject) => {
            const xhr = new XMLHttpRequest()
            xhr.open('GET', url)
            xhr.send()
            xhr.onreadystatechange = function () {
                if (xhr.readyState == 4) {
                    if (xhr.status >= 200 && xhr.status < 300) {
                        resolve(xhr.response)
                    } else {
                        reject('失败了')
                    }
                }
            }
        })
    }

    sendAJAX('https://api.uixsj.cn/hitokoto/get').then((value) => {
        console.log(value);
    }, (reason) => {
        console.log(reason);
    })
</script>

</html>